Abstract
The pituitary bodies of the classes of vertebrates examined show a remarkable resemblance to one another in the essential features of their structure. The pituitary body of the elasmobranch fishes forms a type peculiar to itself, its chief distinction being a negative one—the nonpossession of a nervous lobe. With this exception the vertebrate pituitary is composed of an epithelial or glandular lobe lying in close relationship with an evagination of the floor of the third ventricle of the brain, the wall of which is peculiarly modified to form a nervous lobe.

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